Haak started playing volleyball at the youth teams of her hometown club Engelholms VS and at the age of fourteen made her debut for the first team in the Elitserien. She became the part of the starting line-up of the team in the 2014/15 season and helped Engelholms VS to win the Swedish Championship for two consecutive seasons. She was elected the Player of the Year by the Swedish Volleyball Federation in both 2014/15 and 2015/16 seasons. In the early years of her career, Haak participated in beach volleyball as well as indoor volleyball. Together with her partner Fanny Åhman, she was fourth in the 2015 U18 European Championships in Riga. After two successful seasons in Engelholm, Haak signed a contract with the French club Béziers VB for the 2016/17 season. With her new team, Haak reached the final at the French Cup where Béziers lost to Venelles 2–3 in very closely contested match. She was the top scorer of the French League in the regular season, and voted the MVP and the best opposite spiker of the season. Despite finishing third in the regular season, Béziers were defeated by the defending champions sixth-seeded Saint-Raphaël at the first round of the playoffs. At the end of the season, Haak joined the Italian side Savino Del Bene Scandicci. In her first season in Italy; Haak became the scoring champion of the league with 491 points, averaging the season's highest 6.14 points per set, and selected for the All Star game while her team Scandicci finishing the regular season in second place, just one point behind Igor Gorgonzola Novara. In the playoffs, Scandicci eliminated Volley Pesaro in the first round but lost to Imoco Volley Conegliano in the semifinals.
International career
Haak made her international debut with the Swedish national volleyball team against Latvia on 10 May 2014 at the age of fourteen, and became the youngest ever volleyball player to represent Sweden at senior level. She was the member of the Swedish U19 teams that won the U19 NEVZA Championships in 2014 and 2015.
Personal life
Haak was born in Perstorp but she later moved to Ängelholm shortly after her father had passed away from stomach cancer when she was 9 years old. Her older sister Anna is also a national volleyball player and was her teammate during her time in Engelholms VS.
